The original sales of the TS were from different companies BUT the key thing is that after DRI takes over a different TS company, all of DRI's salespeople say the same thing " unless you upgrade you'll find that your current ownership will not be able to access the resorts you want" What they don't say is that you will be able to access all the resorts you could access before DRI took over just not the other DRI resorts.
One of the other claims is that the owners find after "upgrading" that their TS ownership has no value even though they paid lots of $$$ to "upgrade" The truth of this is that all of the TS resort systems which DRI has bought out have little to no value. AND the upgraded ownership has little to no value either.
And you think that's worth suing over?
IMO, the Owners didn't do due diligence before buying. They just listened to sales pitches, didn't ask enough questions, didn't do any research online, assumed their ownerships had value, etc etc etc. That's like going to a car sales lot and believing every word the sales people say as gospel truth and buying a new car and then getting mad that the car sales people didn't suggest that you test drive other cars or visit other lots or look online to read about safety and value etc of cars.
As an aside, I bought a very small car once. After I test drove it I made a comment about how small it was. The sales person, a very big (in both directions) man said it looked smaller than it was and it was very comfortable. So I made him get in and show me. He was so uncomfortable. It was so funny to me. I was just being mean at that point because I had already done my research and this was THE car I was going to buy. I get a kick out of making sales people walk the talk.